1.1 本试验方法描述了通过测定纤维素材料（如木浆、棉花和棉短绒）的铜氨溶液的粘度来估算纤维素分子量的程序。该测试方法适用于快速、常规测试大量样品，具有较高的准确性和精密度。本试验方法更新并扩展了美国化学学会（ACS）报告的程序。 2. 1.2 以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 本试验方法适用于纸浆制造的快速控制试验，或用于仔细测定纯棉或木浆的粘滞分子量。 5.2 本试验方法适用于非常大范围的纤维素分子量，因为定义了七种样品尺寸。（样品重量随着纤维素分子量的增加而减少。 ) 5.3 棉花和高分子量纸浆可能难以溶解。( 警告- 只有当样品在没有凝胶的情况下完全溶解时，本试验方法才有效。）

1.1 This test method describes the procedure for estimating the molecular weight of cellulose by determining the viscosity of cuprammonium (CuAm) solutions of cellulosic materials, such as wood pulp, cotton, and cotton linters. This test method is suitable for rapid, routine testing of large numbers of samples with high accuracy and precision. This test method updates and extends the procedure reported by the American Chemical Society (ACS). 2 1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 This test method is suitable for use as a rapid control test for pulp manufacture or for careful determination of the viscometric molecular weight of purified cotton or wood derived pulps. 5.2 This test method is applicable over a very large range of cellulose molecular weights because seven sample sizes are defined. (Sample weights are reduced as cellulose molecular weight increases.) 5.3 Cotton and high molecular weight pulps may be difficult to dissolve. ( Warning— This test method is only valid if the sample dissolves completely without gels.)